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v3.25.2

Intangible Assets | 6 Months Ended
--- | ---
Jun. 30, 2025
Intangible Assets |
Intangible Assets | (5) Intangible Assets Intangible Assets Subject to Amortization, net ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2025 |  | December 31, 2024 |
​ | ​ | Gross | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | Net | ​
​ | ​ | carrying | ​ | Accumulated | ​ | carrying | ​ | carrying | ​ | Accumulated | ​ | carrying |
​ |  | amount |  | amortization |  | amount |  | amount |  | amortization |  | amount |
​ | ​ | amounts in millions |
Customer relationships | ​ | $ | 515 | ​ | (194) | ​ | 321 | ​ | 515 | ​ | (173) | ​ | 342 | ​
Other amortizable intangible assets | ​ |  | 175 | ​ | (104) | ​ | 71 | ​ | 165 | ​ | (96) | ​ | 69 | ​
Total | ​ | $ | 690 | ​ | (298) | ​ | 392 | ​ | 680 | ​ | (269) | ​ | 411 | ​
​ Amortization expense for intangible assets with finite useful lives was $15 million and $15 million for the three months ended June 30, 2025 and 2024, respectively, and $29 million and $30 million for the six months ended June 30, 2025 and 2024, respectively. Amortization expense for amortizable intangible assets for each of the five succeeding fiscal years is estimated to be (amounts in millions): ​
​ | ​ | ​ | ​ | ​
Remainder of 2025 | ​ | $ | 28 | ​
2026 | ​ | $ | 54 | ​
2027 | ​ | $ | 51 | ​
2028 | ​ | $ | 50 | ​
2029 | ​ | $ | 44 | ​
​

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